O/D Gear Housing
 

I've got a spare gear housing for my Penta DP. The original owner had a spare and included it in the sale. I'm not sure what they are worth or if there is a market for it. What information do I need to have from it in order to sell it and identify what it is worth? It is still in the Volvo box so it is OEM.

Anyone know of an interested party? Or how is the best way to find someone?